77379-98-7Relevant articles and documents
SYNTHESIS AND PROPERTIES OF 7,7-DIAMINOQUINONE METHIDES
Pavlickova, Libuse,Vasickova, Sona,Soucek, Milan
, p. 2675 - 2683 (2007/10/02)
Diaminoquinone methides Xa-Xe were prepared by aminolysis of the dicyanoquinone methide IX.From the isolated intermediates XI and XIII a four-step mechanism was deduced, involving addition and elimination steps in the order Ad-E-Ad-E.Condensation of N,N,N',N'-tetramethylchloroformamidinium chloride with 2,6-ditert-butylphenol afforded bis(dimethylamino)-quinone methide Xc which on transamination was converted to the diaminoquinone methides Xa and Xb.Analysis of physico-chemical data of diaminoquinone methides leads to the conclusion that their structure can be represented by the zwitterionic formula XVII rather than the quinonoid formula X.